PostgreSQL self-check config insert template

config.insert.sql

INSERT INTO 
	config (id, host, section, name, value)
	SELECT 
		nextval('seq_config'::text), new.host, new.section, new.name, new.value
	FROM (
		SELECT DISTINCT host, '<SECTION>' AS section, '<NAME>' AS name, '<VALUE>' AS value FROM config
	) AS new
	WHERE NOT EXISTS (
		SELECT notexists.host 
		FROM config AS notexists 
		WHERE notexists.section = new.section AND notexists.name = new.name AND notexists.host = new.host
	);